...how does NCOWS enforce this rule...what are the guidelines to what is a shortstroked rifle?
Wild Ben Raymond
Short answer: This is a rule that will need to be enforced the same way we enforce the 'no zippered fly' rule.
While there is always the possibility of exception, for the most part a shooter would be aware of whether their own personal firearms had been short-stroked...that awareness is, in effect, the guideline. If someone truly feels they need to cheat (intransitive verb: to break the rules in a game, examination, or contest, in an attempt to gain an unfair advantage) in order to win, then their's will be a hollow victory. While there will always be those who feel that anything worth winning is worth cheating for, I'm sure those will be a distinct minority...just the same as those who insist on wearing zippered fly trousers. Besides, it would be inherently unfair to actively seek to enforce these rules since, at best, we would only be enforcing them on the incompetent cheats.
The truly devious would employ methods to avoid detection.
The question I'd be interested in hearing the response to is:
If everyone abides by the rules, and only uses firearms and equipment that are approved, how does that impose a disadvantage on anyone?
To quote a wise man
who posted elsewhere, "....suffice it to say that even baseball prohibits corked bats and it doesn't appear to have hurt that sport one bit."